This update for python-python-sql fixes the following issues:

- update to 1.5.1:
  * Use parameter for start and end of WINDOW FRAME
  * Use parameter for limit and offset

- version 1.5.0:
  * naming scheme broken upstream
  * Add MERGE query
  * Support “UPSERT” with ON CONFLICT clause on INSERT query
  * Remove default escape char on LIKE and ILIKE
  * Add GROUPING SETS, CUBE, and ROLLUP clauses for GROUP BY.